[Prev][Next][Index][Thread]
Re: My First PIG and it's operation
Hi Malcolm, coilers,
Malcolm wrote:
>> Hi All,
><snip>
>> If anyone could answer these questions I would be very grateful.
>> 1) Why only 10 mH with 130 turns on a 40 amp variac gapped core?
>
>Gapping a core will drop the induction factor (permeability of the
>core) enormously. Most of the flux in a gapped core ends up in the
>airgap and not the iron. The rationale for gapping in the first place
>is to reduce core flux for a given applied magnetizing force. It also
>turns the inductor into an efficient energy store. Ungapped cores
>store little energy which is what you want in an ideal transformer.
An interesting tradeoff appears. L goes down, but I^2 goes up (where
'I' is the max current w/o saturation) E=0.5*L*I^2. Seems that you want
to maximize energy storage for whatever the max current your system
would otherwise produce. Else - you'd just use an air core (which
doesn't saturate) and would allow a very large I...
Just rambling.
-Bill
Malcolm
<snip>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail-dot-com